| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 9, 2023 | Feb 8, 2023 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 8, 2023 | Feb 7, 2023 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 23, 2022 | Feb 18, 2022 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 12, 2021 | Aug 9, 2021 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 12, 2020 | May 12, 2020 | 000-22345 |
| 4/A | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 14, 2020 | Feb 3, 2020 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 4, 2020 | Feb 3, 2020 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 12, 2019 | Feb 8, 2019 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 7, 2019 | Feb 6, 2019 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 14, 2018 | Feb 12, 2018 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 2, 2018 | Jan 31, 2018 | 000-22345 |
| 4/A | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 13, 2017 | Feb 6, 2017 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 8, 2017 | Feb 6, 2017 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 3, 2016 | Aug 2, 2016 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 23, 2016 | Feb 19, 2016 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 25, 2015 | Aug 24, 2015 | 000-22345 |
| 4/A | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jan 16, 2015 | Jan 7, 2015 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jan 9, 2015 | Jan 7, 2015 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 29, 2014 | May 27, 2014 | 000-22345 |